I needed reading glasses in my 30's after finding that my eyes were sore after reading.
Interesting thread regarding preservation of distance vision:
http://www.iceinspace.com.au/forum/s...d.php?p=239432
Also, I recall reading that laser surgery is not good for night vision since they only correct a 4mm diameter which leaves you with dual focus points if using an exit pupli greater than 4mm? Does anyone know what diameter is corrected with laser surgery?